如何获取类中成员函数的地址

Question

I'm trying to get the address of a member function. Basically I'm trying to get the offset between a windows api function loaded in memory and my function.

This is what I've tried to get the address:

   NTSTATUS (NTAPI myntquerydirectoryfile)(
        HANDLE hFile,
        HANDLE hEvent,
        PVOID pApcRoutine,
        PVOID pApcContext,
        IO_STATUS_BLOCK* ioStatus,
        PVOID pBuffer,
        ULONG bufferSize,
        FILE_INFORMATION_CLASS infoClass,
        BOOLEAN singleEntry,
        PUNICODE_STRING pFileName,
        BOOLEAN restart
    )
    {

        cout << "my func" << endl;

    };


    typedef  NTSTATUS (*pmyhook)(HANDLE hFile,
        HANDLE hEvent,
        PVOID pApcRoutine,
        PVOID pApcContext,
        IO_STATUS_BLOCK* ioStatus,
        PVOID pBuffer,
        ULONG bufferSize,
        FILE_INFORMATION_CLASS infoClass,
        BOOLEAN singleEntry,
        PUNICODE_STRING pFileName,
        BOOLEAN restart);

    pmyhook = &myntquerydirectoryfile;

Answer 1

This code snap shows how to get address of class member functions:

#include <stdio.h>
class A 
{
public:
    void test() 
    {
        // Address of member function test(), is the value of &A::test
        printf("Address of function is: 0x%X\n", &A::test);
    }
};

int main()
{
    A a;
    a.test();
}

Answer 2

In general, it's not allowed and not recommended.

void (Class_Name::* FuncPointer)() = &Class_Name::Func_Name;

FuncPointer will point to the class method.

Better use static function or the lambda feature in C++ 11.